Fig. 64 in The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany)

Fig. 64. Nicimitoceras heterolobatum (Vöhringer, 1960) from the Oberrödinghausen railway cutting (narrowly umbilicate morphotype). A. Cross section of specimen MB.C.31140.1 from unknown bed. B. Cross section of specimen MB.C.31140.2 from unknown bed. C. Cross section of specimen MB.C.31142 from bed 3b. D. Cross section of specimen MB.C.31138.1 from bed 3c. E. Cross section of specimen MB.C.31134 from bed 1. F. Cross section of specimen MB.C.31138.2 from bed 3c. G. Cross section of specimen MB.C.31135.2 from bed 2. H. Cross section of paratype GPIT-PV-63898 from bed 3e. I. Suture line of paratype GPIT-PV-63898 from bed 3e, at dm = 9.5 mm, ww = 5.8 mm, wh = 5.6 mm. J–L. Ontogenetic development of the conch width index (ww/dm), umbilical width index (uw/dm), whorl width index (ww/wh) and whorl expansion rate (WER) of selected specimens. Scale bar units = 1 mm.